Three identical bidentate ligands complexed with penta- and hexa-co-ordinate phosphorus: stereospecificity of the P V ? P VI transformation

Abstract
The substitution of bidentate ligands for chlorine, in benzene solution, for phosphorus pentachloride, leads to the equilibrated phosphoranes (4)(5). Because of its insolubility the bridged bispentaoxyphosphorane (4a) has been isolated. The addition of a weak base (dimethylformamide) in this system shows the existence of the (5)(6) equilibrium. A stereospecific transformation PV→ PVI is obtained by the addition of an optically active strong base, (–)-brucine.
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